At 07:08 PM 9/1/99 +0100, you wrote:
At 09:56 PM 8/31/99 -0700, Don wrote:
And I being more cowardly like to power down and let sit for a while and
make the adjustment 'cold'. Then power up and see how you did. Repeat if
[Could you please limit your line length to something sane, like 80
It should be now. Let me know how many chars/line you're getting.
That's the smart way to do it! That CRT
high voltage sure hurts! But
Colour is a lot worse than monochrome...
But they both hurt! Color TVs use ~25kV and if I remember right most
B/W sets use ~18 to 20 kV depending on the CRT size.
But to rotate the yoke, you're not working very near the EHT. The only
thing you have to worry about is the 1kV-ish pulses on the horizontal
Unless the HV arcs. I've seen it happen more than once. Even 1000
volts isn't pleasant!
beware that the CRT can act like a capacitor and
store charges for a LONG
time. I used to take new CRTS out of the shipping boxs where they had been
sitting for a year or more and they would still bite me! Also most
monitors and TVs have a hot chassis and one side of the AC line is
connected directly to the frame. So unplug them before touching it and
TVs : Certainly in Europe, almost all modern TVs have an isolated
chassis. Mainly because all our TVs have a 'SCART socket' which carries
line-level audio, composite video, RGB, etc. It's a lot easier to isolate
the PSU (most TVs have an SMPSU anyway) than to isolate the dozen or so
signals on that socket. I can't comment on US-TVs, though -- are they
really still hot-chassis?
Yeap, unless they've changed in the last couple of years.
Monitors : For much the same reason (it's hard to isolate a composite
video signal, at least without mangling it), almost all monitors have
an isolated chassis. Having worked on dozens of monitors from just about
every manufacturer, I've come across exactly _1_ that had a hot chassis -
the 110V version of the TRS-80 model 1 monitor. Every other monitor has
I've only worked on a few monitors so I'm not an expert but why take a
chance? The TRS model I monitor was a modified TV. It and others like it
would almost certainly have a hot chassis.
I don't think finding a hot-chassis is much of a worry here.
Then you're lucky!